Abstract
Chemical speciation of brine and groundwater is examined to assess the distribution of chemical stability and behaviors of their solutions. Brine and groundwater are randomly collected from Ban Muang and Wanon Niwat District, Sakon Nakhon province. Hydrochemical parameters and also chemical compositions of their major ions are examined to evaluate the hydrochemical facies. Brine is generally indicated the Na-Cl type. For major cations, groundwater expresses mainly the sodium and calcium ions. However, brine presents dominantly sodium and potassium ions. Major anions of groundwater display principally the bicarbonate and chloride, but brine shows primarily the chloride and sulphate. The salinity zone of sodium chloride is confined only in the small area. The influence of rock salts in some areas is concerned. Relationship of Na+ and Cl-proves the stoichiometric balance of them. Chemical phases from the saturation indices consist of anhydrite, calcite, dolomite and gypsum, which found most in every sample. Generally, saturation condition of groundwater indicates the under saturation. Besides, saturation indices (SI) of brine state the super saturation for anhydrite. The anhydrite saturation index is obviously presented the supersaturated condition when the total dissolved solids (TDS) are greater than 250,000 mg/L.
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